Problems with viewport orientation and reverse camera view
Somehow, your camera is showing a negative scale transform.
I would:

Swipe the camera's 'Scale' fields in the Item tab and set to 1.
Readjust the camera using its internal settings (Focal length, or Lock Camera to View,  etc)..

Maybe even swipe the padlocks next to the camera's scale to lock it off. You need special reasons to alter it.